Douchalanche 

When one's true douchy nature reveals itself and is as sudden and overwhelming as an avalanche.

We all thought he was okay, but after his douchalanche last week, we try to avoid him now.

Douchalanche by TheJigglypuffNinja August 7, 2011

douchevalanche 

When something so douchey happens that it feels like an avalanche came down on you.

When I heard that Nickelback was named "Band of the Decade" by Billboard, it was like an abominable douchevalanche came rushing down upon my faith in mankind.

douchevalanche by diddle bomb December 26, 2009